/*
	FluorineFx open source library 
	Copyright (C) 2007 Zoltan Csibi, zoltan@TheSilentGroup.com, FluorineFx.com 
	
	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.
	
	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	Lesser General Public License for more details.
	
	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
using System;
using System.Collections;
using System.Reflection.Emit;
using FluorineFx.Util;

namespace FluorineFx.Expression
{
	/// <summary>
	/// This type supports the Fluorine infrastructure and is not intended to be used directly from your code.
	/// </summary>
    class OpIs : BinaryOperator
    {
        public OpIs()
        {
        }

        protected override object Evaluate(object context, EvaluationContext evalContext)
        {
            object instance = Left.EvaluateInternal( context, evalContext );
			object value = Right.EvaluateInternal( context, evalContext );
			if (instance == null && value == null)
				return true;
			if (instance != null && value != null)
				return true;
			return false;
			/*
            Type type = Right.EvaluateInternal( context, evalContext ) as Type;
            if (instance == null || type == null)
            {
                return false;
            }
            return type.IsAssignableFrom(instance.GetType());
			*/
        }
    }
}